Tubular extruded shape



Dec. 3,1935. JVAE, 2,923,047

TUBULAR 'EXTRUDED SHAPE Filed May 17, 1933 Patented Dec. 1935 UNiTED;STATES.

"PATENT. Sort-ice,

TUBULAR EXTBUDED snare John a. Ganoc, New Kensington, Pa, assignor to.

Aluminum Company of America, Pa., a corporation of PennsylvaniaApplication M1111. 1933, Serial No. 671,567

4 Claims. (01. 156-14) This invention relates to improvements in tubularshapes of irregular cross section and par-- ticularly to improvements insuch tubular shapes as are used for window and screen frames and 5 thelike.

Difliculties encountered in obtaining uniformity frames, and the like,which are. more resistantv to deformation and of better appearance thanprevious shapes. A further object is the provision of such improvedshapes which can be 20 readily produced by simple metal workingoperations. Other objects will be apparent from the followingspecification and the drawing in which;

Fig. 1 shows a shape as extruded and embodyscribed, and only lead tocomplicated tool con- 25 25 ing one-form of my invention;

Fig. 2 shows the extruded shape of Fig. 1 in its completed form; I

Fig. 3 shows a modification of my invention as extruded; 30 Fig.4 showsthe extruded shape of Fig. 3 in its completed form.

. The shape shown as extruded infFlg. 1, and in its finished form inFig. 2, is typical of the shapes used in the manufacture of screenframes. As ex 35 truded the shape consists essentially of a base portionI and a cantilevered portion 2 of angular shape provided with adepending leg 3, the base portion I being provided with an upstandingleg I, and a second'and longer upstanding leg 5. The

10 opening between legs 3 and 4 'isessential to provide support for theportionbftheextrusibn die extending interiorly of the base l-,cantilevered portionz and legs land 4.

- The particular section chosen for illustration is l5 adapted toprovide a: supporting frame for a window screen or the like, the screencloth being fixed in the groove partially formed by the leg 5 by somesuitable fastening means.

The process of extrusion consists in forcing a i body of metal, usuallyheated, through a die of suitable cross-sectiomand the metal as extrudedtakes substantially the same form as the die opening. After the shapeshown in Fig. 1 has been produced by this process the cantileveredportion 2 is folded down either by drawing the shape tubular form. Theclosing through a die or dies or in some other convenientmanner. Thelegs land I are thus brought into abutting relationship, forming alongitudinal seam along the tubular portion of the finished shape.

Previous shapes produced in this manner I have 5 had'the abutting facesof the legs fiator substantially fiat. When such shapes are closed ithas-been found difiicult to obtain a structure in which the facescoincide exactly. This results in an irregular and non-uniform shape. Tocor- 10 rect'this diificulty I provide the legs 3 and lwith a pluralityof complementary inclined surfaces 6 and l, to insure positive alignmentof the parts. Such surfaces can form a simple V, as illustrated in Figs.1 and 2, or can have, a fiat portion 8, as

7 shown in Figs. 3 and 4, which while slightly difv -ferent in form areotherwise the same as the first two figures.

- I have found the shapes so formed besubstantially more resistant todeformation than shapes without such inclined complementary sur-' faces.While'more complex positioning means have been tried, they are no moreeffective for the Purpose than the simple structure shown and de ing aplurality of inclined plane complementary 40 surfaces.

2. An extruded metal shape for screen frames and the like, consisting ofa hollow tubular portio'n having at least one substantially'flat sidewall and another side wall of greater thickness substantiallyperpendicular thereto, an'integrally 1 .formed continuation of said fiatside wall extending beyond said perpendicular side wall and providedwith a substantially perpendicular up standing leg which issubstantially parallel with .the thicker side wall for at least a partof its length, the said thicker side wall of said tubular portion havinga longitudinally extending seam formedby two parts abutting to form saidwall,

each of said parts having a plurality of inclined plane surfacesengaging complementary inclined plane surfaces on the other of saidparts.

3. An open extruded metal shape adapted to be drawn closed to form ahollow tubular memher, said shape in open form comprising separatedadjacent portions provided with complementary inclined surfaces, andsaid inclined surfaces providing surface contacting aligning means forthe adjacent portions when the shape is drawn closed. 4. In an openextruded metal shape adapted to be drawn closed to form a hollow tubularmemher, a, seam comprising inclined surfaces formed onthe faces ofadjacent separated portions of said open shape, said inclined surfacesbeing compleinentary in form and adapted to provide alignment of theseparated portions on drawing the shape closed, said inclined surfacesproviding only superposed surface bearing therebetween.

Jomi E. GANoE.

